The United Nation’s nuclear watchdog says talks with Iran have failed over its disputed atomic activities.

After two days of negotiations a senior team from the International Atomic Energy Agency has been unable to get permission to visit the key military site at Parchin. They suspect it is being used as a test centre for weapon development.

In a statement the agency said:

“It is disappointing that Iran did not accept our request to visit Parchin….despite engaging in a constructive spirit.”

It is the second time in as many months the IAEA team will return without a deal.

The US and Israel have not ruled out using force against Iran’s nuclear facilities if diplomacy and sanctions fail to prevent it developing a bomb.

Earlier the head of Iran’s armed forces said his country would take pre-emptive action against its enemies if its national interests were endangered.